All Patents in class 74/5.37


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All Patents in class 74/5.37
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	238,631	Mar. 08, 1881	C.E. Ball	Dynamo or Magneto-Electric Machine
	1,309,489	Jul. 08, 1919	L.B. Sperry	Double-Gyro Inclinometer